Oslo, August 31st is a 2011 Norwegian drama film directed by Joachim Trier. It is the second film, along with Reprise (2006) and The Worst Person in the World (2021), in Trier's Oslo trilogy. The film is a homage to, and loosely based on Pierre Drieu La Rochelle's novel Will O' the Wisp (1931) and Louis Malle's feature film The Fire Within (1963).
